Techniks 83508-1/4 | 1/4" Capacity x 1/4" Shank x 0.570" Width EOC 8 ColletTechniks mission is to provide high quality and innovative solutions that optimize manufacturing processes for customers engaged in metalworking, composites machining, and woodworking to meet the most challenging applications, improve machining processes, and create cost efficiencies. Techniks Precision Perske Style Collets are DIN 6388 standard. They are made from high carbon steel and are precisely machined to achieve T. I. R. of 0. 0004" or less.